Search Publications
The ultraviolet spectrum of the peculiar A star HD 51418.
Shore, S. N.; Adelman, S. J.
High-dispersion observations of the peculiar A star HD 51418 have been carried out in the ultraviolet by the IUE satellite. Atomic resonance lines observed in the regions 1800-2000 and 2500-3000 A include those of Mg II, Ti II, Cr I, Cr II, Mn II, Fe II and Zn II, and possibly Si II, S I, V II, Fe I, Co II, Y II, Ce II, Ce III, Eu II, Eu III and T…
Ultraviolet observations of the Be star and X-ray binary 4U 1145-61 (=HD 102567 = HEN 715) obtained with the IUE.
Hensberge, H.; Burger, M.; De Loore, C. +1 more
Two high resolution spectrograms in the range of 1150-2050 A were obtained by the IUE satellite, and from the spectrograms line lists of the stellar and interstellar absorption were compiled. The most important ions were found to be He (+); one, two and three times ionized C and Si; two and three times ionized O, three times ionized Mn; and two, t…
COS-B observations of gamma-ray emission from local galactic features
Caraveo, P. A.; Bignami, G. F.; Hermsen, W. +7 more
Evidence for large scale correlations between the high-energy photon sky and the known local distribution of diffuse interstellar matter is discussed. Evidence is presented of correlations with the Gould's Belt and the Dolidze Belt. The correlations indicate that the emission of gamma rays at medium latitudes can be explained by the distribution o…
A study of the spectrum of WZ SGE during its 1978 outburst.
Friedjung, M.
High dispersion short wavelength region IUE spectra of WZ Sge were obtained by the VILSPA tracking station near Madrid in December 1978. The profiles, both absorption and emission, are classified, and their regions of formation are considered in the framework of the standard accretion disk and excretion disk models. The C IV resonance blend is sho…
UV observations of the BL Lac object 0716+71.
Kollatschny, W.; Fricke, K. J.; Schleicher, H.
UV observations acquired by the IUE satellite of the BL Lac object 0716+71 are presented. Data were obtained in both the long- and short-wavelength ranges (2400-3000 and 1250-1900 A) and reduced using the spatially resolved line by line spectrum and the geometrically and photometrically corrected image in view of the very low signal-to-noise ratio…
IUE spectroscopy of hot binary stars HD 108,HD 149404 and HD 163181.
Hutchings, J. B.; van Heteren, J.
High-dispersion IUE UV spectra of the hot binaries HD 108, HD 149404 and HD 163181 obtained at several orbital phases is presented in an attempt to assess the influence of the companion on stellar wind outflow. Spectra of HD 108, which has an extreme Of spectrum in the visible, show velocity changes over a range of 40 km/sec in the weak absorption…
IUE spectra of the hot close binary V Pup.
Koch, R. H.; Pfeiffer, R. J.; Perry, P. M. +1 more
Low- and high-dispersion ultraviolet spectra obtained by the IUE of the early B-type close binary V Puppis are reported. The continuum derived from the low-dispersion images is consistent with a solar abundance model of effective temperature 25,000 K and log surface gravity 4.0. The high-dispersion spectra show shallow double lines, representing D…
Ultraviolet Study of U1341-CYGNI = CYGNUS-X-2 - Observations of an Accretion Disk
Maraschi, L.; Tanzi, E. G.; Chiappetti, L. +1 more
Observations of Cyg X-2 with the International Ultraviolet Explorer in the range 1200-3000 A are discussed with particular reference to the continuum. The dereddened UV spectrum indicates the presence of a contribution from a hot region of small area which is naturally interpreted as an X-ray heated accretion disk. Assuming an average X-ray lumino…
The spectra of two new intermediate helium stars.
Drilling, J. S.
The stars designated as LSS 2394 and LS II + 36 deg 37 in the Case-Hamburg Luminous Stars surveys are found to be intermediate helium stars. The environment and spectrum of LSS 2394 (CPD -62 2124) appear to be quite similar to those of Sigma Ori E in a number of respects, including close proximity to two other OB stars, membership in a rich O asso…
UV and optical observations of X-ray sources in the Magellanic Clouds.
Tanzi, E. G.; Tarenghi, M.; Hammerschlag-Hensberge, G. +7 more
Ultraviolet spectra of the Magellanic Cloud X-ray sources LMC X-4, SMC X-1 and SMC X-2 obtained by the IUE satellite are presented together with simultaneous optical photometry of SMC X-1 and SMC X-2. Short- and long-wavelength IUE spectra for LMC X-4 taken near X-ray eclipse provide no evidence for P Cygni-type emission, despite evidence for mass…